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Overview
| Comment: | More index tweaks -- not done yet. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sourceforge |
| Files: | files | file ages | folders |
| SHA1: |
cb20e39503f7103d2eebbe00a7e58b14 |
| User & Date: | rmsimpson 2006-02-17 06:06:10 |
Context
|
2006-02-17
| ||
| 06:06 | Platform compatibility changes check-in: 2253540b75 user: rmsimpson tags: sourceforge | |
| 06:06 | More index tweaks -- not done yet. check-in: cb20e39503 user: rmsimpson tags: sourceforge | |
|
2006-02-15
| ||
| 05:40 | no message check-in: 4aaa3c5cf6 user: rmsimpson tags: sourceforge | |
Changes
Changes to System.Data.SQLite/SQLiteConnection.cs.
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/// <param name="strTable">The table to retrieve index information for, can be null</param>
/// <returns>DataTable</returns>
private DataTable Schema_Indexes(string strCatalog, string strTable, string strIndex)
{
DataTable tbl = new DataTable("Indexes");
DataRow row;
DataTable tblSchema;
string primaryKey;
tbl.Locale = CultureInfo.InvariantCulture;
tbl.Columns.Add("TABLE_CATALOG", typeof(string));
tbl.Columns.Add("TABLE_SCHEMA", typeof(string));
tbl.Columns.Add("TABLE_NAME", typeof(string));
tbl.Columns.Add("INDEX_CATALOG", typeof(string));
tbl.Columns.Add("INDEX_SCHEMA", typeof(string));
................................................................................
using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
{
using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
{
while (rdTables.Read())
{
primaryKey = "";
if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0)
{
// First, look for any rowid indexes -- which sqlite defines are INTEGER PRIMARY KEY columns.
// Such indexes are not listed in the indexes list but count as indexes just the same.
using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))
{
using (SQLiteDataReader rdTable = cmdTable.ExecuteReader(CommandBehavior.SchemaOnly))
................................................................................
tblSchema = rdTable.GetSchemaTable(false);
foreach (DataRow schemaRow in tblSchema.Rows)
{
if (schemaRow.IsNull("DeclaredType") == false)
{
if ((bool)schemaRow[SchemaTableColumn.IsKey] == true)
{
row = tbl.NewRow();
row["TABLE_CATALOG"] = strCatalog;
row["TABLE_NAME"] = rdTables.GetString(2);
row["INDEX_CATALOG"] = strCatalog;
row["PRIMARY_KEY"] = true;
// If the primary key is of type INTEGER, then its a rowid and we need to make a fake index entry for it.
if (String.Compare((string)schemaRow["DeclaredType"], "INTEGER", true, CultureInfo.InvariantCulture) == 0)
{
row["INDEX_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
row["UNIQUE"] = true;
tbl.Rows.Add(row);
break;
}
// Otherwise, record this primary key's index name so we can match it up later and mark it as a primary key
else primaryKey = String.Format(CultureInfo.InvariantCulture, "sqlite_autoindex_{0}_", rdTables.GetString(2));
}
}
}
}
}
// Now fetch all the rest of the indexes.
using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_list([{1}])", strCatalog, rdTables.GetString(2)), this))
{
................................................................................
row = tbl.NewRow();
row["TABLE_CATALOG"] = strCatalog;
row["TABLE_NAME"] = rdTables.GetString(2);
row["INDEX_CATALOG"] = strCatalog;
row["INDEX_NAME"] = rd.GetString(1);
row["UNIQUE"] = rd.GetBoolean(2);
if (rd.GetString(1).StartsWith(primaryKey, StringComparison.InvariantCultureIgnoreCase))
row["PRIMARY_KEY"] = true;
tbl.Rows.Add(row);
}
}
}
}
}
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/// <param name="strTable">The table to retrieve index information for, can be null</param>
/// <returns>DataTable</returns>
private DataTable Schema_Indexes(string strCatalog, string strTable, string strIndex)
{
DataTable tbl = new DataTable("Indexes");
DataRow row;
DataTable tblSchema;
Collections.Generic.List<int> primaryKeys = new List<int>();
bool maybeRowId;
tbl.Locale = CultureInfo.InvariantCulture;
tbl.Columns.Add("TABLE_CATALOG", typeof(string));
tbl.Columns.Add("TABLE_SCHEMA", typeof(string));
tbl.Columns.Add("TABLE_NAME", typeof(string));
tbl.Columns.Add("INDEX_CATALOG", typeof(string));
tbl.Columns.Add("INDEX_SCHEMA", typeof(string));
................................................................................
using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
{
using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
{
while (rdTables.Read())
{
maybeRowId = false;
primaryKeys.Clear();
if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0)
{
// First, look for any rowid indexes -- which sqlite defines are INTEGER PRIMARY KEY columns.
// Such indexes are not listed in the indexes list but count as indexes just the same.
using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))
{
using (SQLiteDataReader rdTable = cmdTable.ExecuteReader(CommandBehavior.SchemaOnly))
................................................................................
tblSchema = rdTable.GetSchemaTable(false);
foreach (DataRow schemaRow in tblSchema.Rows)
{
if (schemaRow.IsNull("DeclaredType") == false)
{
if ((bool)schemaRow[SchemaTableColumn.IsKey] == true)
{
primaryKeys.Add((int)schemaRow[SchemaTableColumn.ColumnOrdinal]);
// If the primary key is of type INTEGER, then its a rowid and we need to make a fake index entry for it.
if (String.Compare((string)schemaRow["DeclaredType"], "INTEGER", true, CultureInfo.InvariantCulture) == 0)
{
maybeRowId = true;
}
}
}
}
if (primaryKeys.Count == 1 && maybeRowId == true)
{
row = tbl.NewRow();
row["TABLE_CATALOG"] = strCatalog;
row["TABLE_NAME"] = rdTables.GetString(2);
row["INDEX_CATALOG"] = strCatalog;
row["PRIMARY_KEY"] = true;
row["INDEX_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
row["UNIQUE"] = true;
tbl.Rows.Add(row);
primaryKeys.Clear();
}
}
}
// Now fetch all the rest of the indexes.
using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_list([{1}])", strCatalog, rdTables.GetString(2)), this))
{
................................................................................
row = tbl.NewRow();
row["TABLE_CATALOG"] = strCatalog;
row["TABLE_NAME"] = rdTables.GetString(2);
row["INDEX_CATALOG"] = strCatalog;
row["INDEX_NAME"] = rd.GetString(1);
row["UNIQUE"] = rd.GetBoolean(2);
row["PRIMARY_KEY"] = false;
// Now for the really hard work. Figure out which index is the primary key index.
// The only way to figure it out is to check if the index was an autoindex and if we have a non-rowid
// primary key, and all the columns in the given index match the primary key columns
if (primaryKeys.Count > 0 && rd.GetString(1).StartsWith("sqlite_autoindex_" + rdTables.GetString(2), StringComparison.InvariantCultureIgnoreCase) == true)
{
using (SQLiteCommand cmdDetails = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_info([{1}])", strCatalog, rd.GetString(1)), this))
{
using (SQLiteDataReader rdDetails = cmdDetails.ExecuteReader())
{
int nMatches = 0;
while (rdDetails.Read())
{
if (primaryKeys.Contains(rdDetails.GetInt32(1)) == false)
{
nMatches = 0;
break;
}
nMatches++;
}
if (nMatches == primaryKeys.Count)
{
row["PRIMARY_KEY"] = true;
primaryKeys.Clear();
}
}
}
}
tbl.Rows.Add(row);
}
}
}
}
}
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